| 1. Round | 10/04/2005 | Lyn Oslo | - | Fredrikstad FK | 1:1 |  |
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| 3. Round | 24/04/2005 | Rosenborg BK | - | Fredrikstad FK | 0:1 |  |
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| 4. Round | 01/05/2005 | Fredrikstad FK | - | Odd Grenland | 1:1 | ||||
| 5. Round | 05/05/2005 | Hamarkameratene | - | Fredrikstad FK | 1:1 | ||||
| 6. Round | 09/05/2005 | Fredrikstad FK | - | SK Brann | 2:3 | ||||
| 7. Round | 16/05/2005 | Vålerenga IF | - | Fredrikstad FK | 0:0 | ||||
| 8. Round | 23/05/2005 | Fredrikstad FK | - | Tromsø IL | 4:2 | |
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| 9. Round | 29/05/2005 | Aalesunds FK | - | Fredrikstad FK | 1:0 | ||||
| 10. Round | 12/06/2005 | Fredrikstad FK | - | FK Bodø/Glimt | 3:2 | |
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| 11. Round | 19/06/2005 | Molde FK | - | Fredrikstad FK | 2:1 | ||||
| 12. Round | 26/06/2005 | Lillestrøm SK | - | Fredrikstad FK | 3:0 | ||||
| 13. Round | 03/07/2005 | Fredrikstad FK | - | IK Start | 1:2 | |
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| 15. Round | 31/07/2005 | Viking FK | - | Fredrikstad FK | 2:1 | ||||
| 18. Round | 13/08/2005 | Fredrikstad FK | - | Hamarkameratene | 1:1 | ||||
| 19. Round | 29/08/2005 | SK Brann | - | Fredrikstad FK | 4:0 | ||||
| 20. Round | 13/09/2005 | Fredrikstad FK | - | Vålerenga IF | 0:4 | ||||
| 21. Round | 18/09/2005 | Tromsø IL | - | Fredrikstad FK | 2:0 | ||||
| 24. Round | 16/10/2005 | Fredrikstad FK | - | Molde FK | 1:1 |
Norway